Abstract
The formation and local symmetry of a spin–lattice polaron has been investigated semiclassically in planar Holstein t–J-like models within the exact diagonalization method. Due to the interplay of strong correlations and electron–lattice interaction, the doped hole may either move freely or lead to the localized spin–lattice distortion and form a Holstein polaron. The formation of a polaron breaks the translational symmetry by suppression of antiferromagnetic correlations and inducement of ferromagnetic correlations locally. Moreover, the breaking of local rotational symmetry around the polaron has been shown. The ground state is generically a parity singlet and the first excited state may be a parity doublet. Further consequences of the density of states spectra for comparison with scanning tunneling microscopy experiments are discussed.
Highlights
Doping a Mott insulator is regarded as the main physics in high Tc cuprate superconductors [1]
One reason is that the angle-resolved photoemission spectroscopy (ARPES) data in doped metallic cuprates, which showed the broadening of spectral lines at a certain momentum, revealed the band dispersion renormalized by el–ph interaction [11]
In the presence of strong el–ph coupling, both the spin and lattice degrees of freedom become entangled and the spin polaron may transform into a spin–lattice polaron
Summary
Doping a Mott insulator is regarded as the main physics in high Tc cuprate superconductors [1]. The doped charge carriers in the presence of both strong electronic correlations and electron–phonon interactions may lead to the formation of a spin–lattice polaron. Due to the interplay of competing electronic correlations and el–ph interactions, the doped hole may either move through the lattice freely or favor the composite spin–lattice polaron.
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